\begin{tabular}{l*{11}{c}}
\hline
                 &\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}\\         &\multicolumn{1}{c}{4}&\multicolumn{1}{c}{5}&\multicolumn{1}{c}{6}&\multicolumn{1}{c}{7}&\multicolumn{1}{c}{8}&\multicolumn{1}{c}{9}&\multicolumn{1}{c}{10}&\multicolumn{1}{c}{11}&\multicolumn{1}{c}{12}&\multicolumn{1}{c}{13}&\multicolumn{1}{c}{14}\\ \hline  \emph{Second stage}\\
Enrollment  &      -0.040***&      -0.049***&      -0.048***&      -0.052***&      -0.053***&      -0.033** &      -0.026   &      -0.020   &      -0.018   &      -0.018   &      -0.020   \\
            &     (0.012)   &     (0.012)   &     (0.013)   &     (0.014)   &     (0.014)   &     (0.016)   &     (0.017)   &     (0.016)   &     (0.016)   &     (0.016)   &     (0.015)   \\
\hline
Controls    &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   \\
F-stat      &         230   &         221   &         230   &         235   &         231   &         230   &         233   &         225   &         224   &         227   &         233   \\
N           &        3662   &        3637   &        3634   &        3619   &        3599   &        3573   &        3552   &        3521   &        3497   &        3452   &        3403   \\
Mean of Y   &        0.86   &        0.84   &        0.83   &        0.81   &        0.80   &        0.79   &        0.78   &        0.77   &        0.76   &        0.76   &        0.75   \\
\hline
\end{tabular}
